Look into solid state relays (SSR) http://www.sparkfun.com/products/10636
. Although, you mention a 3 pin socket, which leads me to assume you are looking for a relay that a device can plug directly into. With the SSRs, you would need to cut up your plug and attach the wires directly to their corresponding terminals on the relay.
Additionally, check out this relay kit from SFE http://www.sparkfun.com/products/11042
Be very careful when dealing with these high voltages.